Abstract
Rotational transition probabilities and cross sections for HD+ in collisions with He have been calculated for different initial rotational states and at collision energies below the threshold for vibrational excitation. To obtain more information about the different physical parameters influencing rotational transitions in molecular ions, a semiclassical strong-coupling method has been used instead of a fully quantal method. Due to the influence of the shorter range overlap forces and the presence of longer range induction forces the interaction for atom-molecular-ion collisions is much stronger than for atom-neutral-molecule collisions. This results in rotational transition cross sections which are of the same order for all energetically accessible states whereas in the case of neutral molecules the cross sections for higher order transitions decrease rapidly.
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